1025420 has 48 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 361920.

The previous prime is 1025419. The next prime is 1025443. The reversal of 1025420 is 245201.

1025420 = T₁₂₀ + T₁₂₁ + ... + T₁₉₈.

It is a junction number, because it is equal to n+sod(n) for n = 1025395 and 1025404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12941 + ... + 13019.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2^1025420 is an apocalyptic number.

1025420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1209600).

1025420 is an abundant number, since it is smaller than the sum of its proper divisors (1393780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1025420 is a wasteful number, since it uses less digits than its factorization.

1025420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1025420 is about 1012.6302385372. The cubic root of 1025420 is about 100.8402533025.

The spelling of 1025420 in words is "one million, twenty-five thousand, four hundred twenty".